Google Adwords has better integration with Google Analytics and can give you a clearer picture of what Adwords visitors do on the website

Reporting is simple

Detailed reporting, you can drill down into everything

Adwords Express doesn’t support the advanced features that Google Adwords does.

Google Adwords allows to you use many of the more advanced features.

For instance you can run callouts & site links that many of your competitors are running.

Remarketing and advanced advertising formats are available (read what remarketing is).

Google Adwords support Youtube ads.

Google Adwords Express may work for small businesses without the time and knowledge who want to run ads, but if you’re running campaigns spending hundreds of pounds a month, and your competitors are running Google Adwords campaigns with all the features then it is certainly worth considering running the full package even if that involves hiring a Google Adwords professional. You’ll need to look at your costs to see if it’s justified.